curl-6 on 25 May 2020
According to VGChartz, PS2 sold 25.57 million outside the major regions (North America, Japan, and Europe) so not an insignificant amount.
PS2 also benefited from the PS3 stumbling out of the gate with a $600 price tag and so not quickly replacing it. PS5 is unlikely to trip up the same way and Sony have talked about wanting to transition players from PS4 to PS5 more quickly than in past generational shifts: https://www.gamespot.com/articles/sony-wants-a-faster-shift-from-ps4-to-ps5-than-in-/1100-6471259/
